{
  "manageEntity": {
    "action": "Save",
    "entityId": "66720",
    "entityType": "Track",
    "nonce": "0x02adf24c2b10aafd3fd47fd4754d75a5d131f5796f3ddda2c88441b0569d6542",
    "signature": "0xa8e002b5fc1d911f7ac8680610dd92254f230a2c7b145bb84843bc3c9ffa310d2daecb5d17c603beb700e0f4b417837013434354e08f059fb4786c3ce50b968a1b",
    "signer": "0x5A2b21D1d4240B0d6eC130512D4b578aec735125",
    "userId": "862976792"
  }
}